Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (19)
- Vortrag (8)
- Beitrag zu einem Tagungsband (4)
- Posterpräsentation (3)
Schlagworte
- Fluorescence (16)
- Microfluidics (9)
- Smartphone (6)
- Fluoreszenz (4)
- MIP (4)
- Mikrofluidik (4)
- Rapid test (3)
- Test strip (3)
- Adulteration (2)
- Air quality (2)
- Chlorine (2)
- Core-shell particles (2)
- Diesel (2)
- Environment (2)
- Fluorescent sensor (2)
- Schnelltest (2)
- Sensorpartikel (2)
- Spectroscopy (2)
- Test strips (2)
- Teststreifen (2)
- 3D-Mikrofluidik (1)
- Advanced materials (1)
- Amino acids (1)
- Ammunition (1)
- BODIPY (1)
- BODIPY dyes (1)
- BODIPY probe (1)
- BODIPY-Farbstoffe (1)
- Bacteria (1)
- Benzin (1)
- Biofilm (1)
- Biofouling (1)
- Biosensor (1)
- Boronic acid (1)
- Cellulose (1)
- Chlor (1)
- Cocaine (1)
- Drogenanalytik (1)
- Droplets (1)
- Dyes (1)
- E. coli (1)
- ELISA (1)
- Electrochemical (1)
- Elektrochemie (1)
- Embedded sensor (1)
- Embedded system (1)
- Emmbedded sensor (1)
- Fluor-Substitution (1)
- Fluorezsenz (1)
- Fuel adulteration (1)
- Fungi (1)
- Gasoline (1)
- Gated delivery system (1)
- Gold-Katalyse (1)
- Hybrid nanoparticles (1)
- Immunassay (1)
- Immunoassay (1)
- Kerosene (1)
- Kokain (1)
- Lab-on-chip (1)
- Mercury (1)
- Micro-Hydrocyclone (1)
- Microbial (1)
- Microfluidic (1)
- Microfluidic Chip (1)
- Microfluidic sensor (1)
- Mikrobiell (1)
- Molecular imprinting (1)
- Molecular rotor (1)
- Molecularly Imprinted Polymers (1)
- Molecularly imprinted polymers (1)
- Munition (1)
- Oil (1)
- Oil spills (1)
- PCA (1)
- PFAS (1)
- Particles (1)
- Partikeln (1)
- Pesticide (1)
- Pestizid (1)
- Petrol (1)
- Petroleum (1)
- Phosphorylated peptides (1)
- Photostabilität (1)
- Portable (1)
- Sensor (1)
- Sensor Materials (1)
- Sensoren (1)
- Sensory particles (1)
- Speichel (1)
- Sugars (1)
- TNT (1)
- Test Streifen (1)
- Urin (1)
- Velocimetry (1)
- Wasser (1)
- Water (1)
- Water analysis (1)
- Water quality (1)
- Wireless mobile sensor device (1)
- Zellulose (1)
- agricultural economy (1)
- embedded sensor (1)
- environment (1)
- fluorescence (1)
- gas analysis (1)
- spectroscopy (1)
- Öl (1)
Organisationseinheit der BAM
- 1 Analytische Chemie; Referenzmaterialien (25)
- 1.9 Chemische und optische Sensorik (25)
- 8 Zerstörungsfreie Prüfung (6)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (6)
- 1.8 Umweltanalytik (3)
- 4 Material und Umwelt (2)
- 4.0 Abteilungsleitung und andere (2)
- 4.1 Biologische Materialschädigung und Referenzorganismen (1)
- P Präsident (1)
- PST Präsidiale Stabsstelle (1)
Paper des Monats
- ja (2)
Eingeladener Vortrag
- nein (8)
In the present paper the development of a semi-automated device for long-term monitoring of gaseous ammonia is described. A sensor material was produced that changes its optical properties in the pres-ence of low concentrations of ammonia in air. The implementation into an electronic device enables precise, simple, economic and fast monitoring of low concentrations of harmful gases, like ammonia, and hence can help to improve the climate monitoring in livestock housing, barns or stables.
Currently, the development of portable devices to detect traces of chemical species by real time monitoring is a highly topical research area in the chemical sciences. Indeed, the lowering of standards for pollutants in drinking water requires the development of new technologies and devices. In this context, gated sensory nanoparticle systems for selective and sensitive recognition of targets such as heavy metal ions, small molecules or oligonucleotides are excellent candidates[1,2]. Provided that such sensory delivery systems are highly porous nanoparticles loaded with indicator dyes and capped with bulky stoppers that can be uncapped only by the designated analyte, an integration with a microfluidic tubing system designed for droplet-assisted liquid-liquid extraction enable separation of released from still particle-confined dye by phase-transfer extraction and subsequent selective detection by fluorescence. The incorporation in a simple microfluidic tubing system is an innovative way towards the realization of a sensor for trace analysis of target molecules in real time.
Because of the globally increasing prevalence of diabetes, the need for accurate, efficient and at best miniaturized automated analytical systems for sugar detection is still urgent. The development of molecular probes for sugar based on boronic acid receptors1 offers an excellent alternative to the kinetically slow enzyme-based sugar sensors. Moreover, by coupling such chelating units with rhodamines, fluorescein or BODIPY moieties, colorimetric and/or highly fluorescent sugar sensing schemes can be obtained.2 In this work, a boronic acid-functionalized BODIPY probe is described; it binds selectivity to fructose's adjacent diols to form cyclic boronate esters in partially aqueous solutions, with a broad pH range compatibility and a sensitivity in the micromolar range. To enhance the applicability of the fluorometric test in the sense described above, integration with a microfluidic sensor was achieved. The miniaturization of chemical analysis systems yields many functional and economical benefits such as low cost, ease of use, high stability and good portability. With similar selectivity and sensitivity, fructose was detected by fluorescence in real time in the chip, and an assay for the straightforward detection of sugar in sodas was achieved.
2,4-D ist ein in der Landwirtschaft weitverbreitetes Pflanzenschutzmittel, das Grundwasser kontaminiert, sich innerhalb der Nahrungskette anreichert und Umwelt- und Gesundheitsprobleme verursachen kann. Hier stellen die Autoren ein mikrofluidisches Nachweissystem für die Echtzeitdetektion von 2,4-D in Grund- oder Oberflächenwasser vor. Es basiert auf der Kombination 2,4-D-selektiver, fluoreszierender, molekular geprägter Polymer-(MIP-)Mikropartikel mit einem 3D-mikrofluidischen Extraktions- und Detektionssystem. Messungen vor Ort sollen damit künftig möglich sein.
Chlorination of pool water and wastewater, in food and pharmaceutical production, as well as in pesticide and paper manufacturing is a routinely used technique. However, the amount of chlorine in water must be strictly adjusted, to ensure enough concentration to kill pathogenic bacteria and viruses, while preventing too high concentrations inducing negative effects on human health. As an indicator, a molecular fluorescent probe based on a BODIPY structure was designed. This indicator exhibits a sensitive and selective fluorescence response upon increasing concentrations of hypochlorite in aqueous solvent mixtures. Real-time analyses became possible after the integration of this fluorescent indicator into newly designed 2D & 3D microfluidic chips incorporating a passive sinusoidal mixer and a micro-hydrocyclone, respectively. A comparison of the two microfluidic systems, including their ability to prevent accumulation or circulation of microbubbles, has shown excellent fluidic behaviour for the micro-hydrocyclone device. This system was distinctly more robust against gas bubbles, showed a higher signal gain and allowed to halve the limit of detection to 0.02 mg L–1. The use of the 3D system to quantify the chlorine content of pool water samples for sensitive and quantitative chlorine monitoring has been demonstrated.
The present paper describes the development of a sensor material that changes its fluorescence in the presence of gaseous ammonia in a relevant concentration range. The implementation into a semi-automatic gas measurement device enables low-cost, precise, simple and fast monitoring of low con-centrations of harmful gases, like ammonia, and hence can help to improve the climate monitoring in livestock housing, barns or stables.
The globe's seas were used as dumping ground after the world wars and those millions of ammunition, most of all containing 2,4,6-trinitrotoluene (TNT), represent a pressing danger for fishermen, dredging operations, submarine cable installations and tourism. We developed an extremely selective indication method for TNT based on a specific reaction that produces a highly fluorescent compound. The indication system was integrated into a microfluidic PDMS chip for the solid-liquid extraction of TNT from water samples, offering environmental monitoring possibilities. Combining the advantages of a light-up indicator, microfluidics and a smartphone as detector, the embedded sensor allows for the remote and rapid detection of TNT down to ng in surface and sea waters.
A droplet-based microfluidic sensor was developed for the detection of Hg2+ traces in water. The approach uses gated mesoporous nanoparticles loaded with a fluorescent BODIPY dye. The squaraine-based gating mechanism is highly selective for Hg2+ and the indicator release mechanism ensures sensitive detection. The microfluidic system is modular and was assembled from simple PTFE/PFA tubes, while detection was realized with standard optomechanic, optic, and electronic parts. The sensor shows a stable response without memory effects and allows the detection of Hg2+ in water down to 20 ppt.